Fibroblastic meningioma in cattle in semi-arid of Paraiba, Brazil /Meningioma fibroblastico em bovino no semiarido da Paraiba

A case of fibroblastic meningioma is reported in a bovine, presenting depression, purulent nasal discharge, bruxism, eyelid ptosis, tongue paralysis, and trismus. At necropsy there was a tumor in the region of the right frontal cortex, occupying the right lateral ventricle. Microscopically it was composed by neoplastic meningothelial cells. The diagnosis was performed based on histologic characteristics and confirmed by immunohistochemistry revealing that tumor cells were positive for vimentin and negative to cytokeratin, glial fibrillary acidic protein, and neuron specific enolase. Diseases of the central nervous system are important in cattle in the semiarid region of northeastern Brazil, and tumors of the brain and spinal cord should be included in the differential diagnosis of this group of diseases. Key words: ruminants, neoplasia, central nervous system. Descreve-se um caso de meningioma fibroblastico em bovino no semiarido da Paraiba. O animal apresentava depressao, descarga nasal purulenta, bruxismo, ptose da palpebra, flacidez da lingua e trismo. Na necropsia, havia uma massa tumoral na regiao do cortex frontal direito, que ocupava o ventriculo lateral direito. Microscopicamente, era formado por celulas meningoteliais neoplasicas. O diagnostico foi realizado pelas caracteristicas histologicas e confirmado pela imuno-histoquimica, que revelou marcacao positiva para vimentina e negativa para citoqueratina, proteina acida fibrilar glial e enolase neuro-especifica. As neoplasias do sistema nervoso central, diagnosticadas em bovinos no semiarido do nordeste brasileiro, embora raras, devem ser incluidas no diagnostico diferencial das doencas de bovinos que apresentam sinais nervosos. Palavras-chave: ruminantes, neoplasia, sistema nervoso central.